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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a330b04d890987fd69665746e783be47b569f5ee94ce9690bc8815be9ef01b' 
  AND token = 'F/5a02ak3M57AWQCNkCd0JMRH2PfFLNeNrHPIzdMYXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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