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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b1f2ecbace8d917b28dae3e68417d43809c34a23c6164e8c00ece57f1329af8' 
  AND token = 'JKPEEQPOpvPGnJ/RC0CAobKxVWP1O7mrydpgD8GZCjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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