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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4cddc8a30c0fc66892769b8147e7707b088f2a05d24035f9be2403dacfcc785' 
  AND token = '84ULQ/XYEcy49UQ5fWm8HBFu8aMtsN2YYn58X4ldrnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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