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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce592174b6b57b00fb857196fd63a6467222053ada98010ca7b5077511176ae1' 
  AND token = 'hxmltOBe1gfr1W5/k2aQN4/Z/l5NscI1yvEIRZyiMvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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