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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4502c1bc40b095efc878300ca9176ed5fe2e768f8c568ac0b339784478735b0' 
  AND token = 'Ngn6ijHh5nhHOPIDM5Edh58eouXqRSXG+SbsD9Wm59o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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