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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c0e9369d4b9c13e09d5b1230c29a474150cff83c89a05bff44212f9cad62ff6' 
  AND token = 'DRvsQKiFdbqXHfr5Z7N9DJBr5R+XA23sft+i+lyPq9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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