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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b87cd5022a4f0f8552b2609ff6a9516755e0b009d5e9f28f01a60a389cba13a9' 
  AND token = 'evq2d5U+qu+8XUwHXm8sy4/xDSuBauL16MKKvug2R1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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