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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '567d00992b365d4072e5e52cb9a184579f4be229a434374eb8e67eb276c48474' 
  AND token = '5078G7nBDsaRv6+39Fqc0no5KKlMzPDTEXk3luCeeOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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