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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ab5eb033b58d1e14627837275684e420b643474912396bf98db4c7c81534765' 
  AND token = 'geUuPq/fe24AL6f1KeDAM0+96XpCj83fLqmQ8hQ+c8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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