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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f520c4ea2503092e6d2b24182ffcb86f64ca10d234f443280edddc02f63b75a7' 
  AND token = 'c41aQ3no5NJwXpjiu2rstiEIBtmlFf7V4cElHyT2Sug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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