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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f871bea4a0577019f8f0560d320e3f9996d2dadabb88e4a1f098f9615a1eb585' 
  AND token = 'dHVeS43hoRpzxdN6onPKGTJNLtVAEfoVSZCWfS/twhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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