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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '558417f52d437116ca42f19d7cd97a4e3a1a3fb2d48a277dbaa8300a108ee9a8' 
  AND token = 'aZjabPLrmLs26LawV00eReAj+N+q6a1dcWK6wIbsbrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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