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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b09235e96c60ca36c5adf3e1b42f3742bb59da9fd21301dab48f0884b52dbad9' 
  AND token = 'AMKwrRllpfsm/+b0p1FhPrA267cLULFfqBaEX7wnVu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00196

JSON explain

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