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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6c086d4d37d41c4a2eb674481f4a206baadcd451d3459cc37f6d3af58f495a' 
  AND token = 'OFT+D3Jv+ezMoAzahtHofK/Hp+qOFTnWe7+bg2c4xlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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