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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0d4b08d1d30ca14ad767b25cca6ffe37d33c206cac3a8af375383c3d1cdb219' 
  AND token = '+CGhD7zhEg4fSbUBmtgLmujYk9JwSeb0rRQOpvlBWMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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