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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee7a991fbc6db761b8ebf32d6a0be4ea84e0e80fbfb4ba4fa42b3fccba89d2a3' 
  AND token = 'BDmSh6dbVLwO1rfT94lfVW5QkYGRxa0PopfEI5pBl0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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