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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e8cd0e4121ee907266a1eb0e4fb31530b03f2b060b98a5ade521e959446d21e' 
  AND token = '2j/r0xmS7y9S3/I25aZvdyvnDlkMsBShWfVKsUZcDjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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