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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a340c867a7d10f2ad0c1ca931e5da57d2f0894b1eedb2cfbd7d1483ffe87beb2' 
  AND token = 'Iv6wxYfc2vjHW3ZVjzhiF4eCTILF2iS1/u4e8oP3vIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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