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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a19d29ebf4cebe9c7a266f672cf558eed103477c0f0e6c4831acf4291d0d33e' 
  AND token = 'PLgFR6buOwUn5F+xM5BygIR2jjqjR9dMcDnBIJ3SsqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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