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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdd702417158aba636e0422695c6a33c8efa89feb92beaf7edb06a967d74cdf8' 
  AND token = '2ZF5XcHQ9iDRvectbUJn4UpchCa/pjpQPbdC69qS6m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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