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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aae8953e4f064e5db50402042917cb6cd3832a3cf650336bd7814d0dee86032' 
  AND token = '352LizasI3trfX0IsoVHbk1LMUKwc2MVaTs6TRqrLbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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