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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c29212c0518b9e69438604978ded9081711b182481c1f80033509b7826025a' 
  AND token = 'AepoU4F46fSY5VXEdn978QU+xuPcb3x3et7g8IXh6DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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