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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc6891f8f7bbb341b5cadf5cd9a93c91069df177f5c862680f081978cc46e7e' 
  AND token = 'NSBX2vAYN/kJ3h8MtkbSO4FsceK7ywmtctNaEYacX7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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