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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '126a7ceaa69786048484a7f853a2a0017d17b2bb124bc7e4fc2549c8941eb152' 
  AND token = '3JQOYg6onBGnaDEeS8evWIoglhlGSfHI+BN3PyYb1dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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