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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '542a645a27516d5535fb7a73ff64aa67e8c72d695aa72f084a1d56b00a997a26' 
  AND token = 'E91d7LAQt/mL+lUlvtGJW0Z65LBdl1pW+kHaNHZdS7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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