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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c36478b94a497e3dcadf03be13dae2df320629031dd895de00507b52fa4e9ad8' 
  AND token = '8ApwA6Nd1iz0FJCTFYxoL4eCLD/ItsL61MZbEVFX69I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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