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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a5f2cdabb4f9c64436e9db45483203f4dee76668b1d3889a16b65acb73ef96b' 
  AND token = 'Sc2pd8ofm4qptGOHm30Ex0V0cgQqbMIgFx0OW1hx+Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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