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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b61bbb0ebbb016a62455438161dd362d6b13401368942e9ff32a64322e607620' 
  AND token = 'dg55fNEwOxlNqibHsbb1n+Jjtyyi48RJXcG60/mB1rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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