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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1f84793aaf8ab48bb5711df690a820538897ed770fd0a663b0c4a1bb5018c6' 
  AND token = '1lcTJG6JGCe14IdgL8v50mHC+3MI2GzJn3bCndqKViY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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