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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7e59375971dbb73702177008aa86ff1f68dd99f1729f38dce213e78914709b' 
  AND token = 'k9Lz2yXVt0JUqUeB3x6iko4ubHZG6JzplZyfagQCzFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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