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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d9961e3a8cab39081f9042c5528387a2c3b3f911f62b06e5263c6e8becc9eee' 
  AND token = '58cyGqFu9CKqP5cIPTZjwmbA+LRFO6lvOWSfUYmH+Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}