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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e2519407f546a08c894d597f3769b9e8e3ecb8e97639fe2575cd5e3f555f2f2' 
  AND token = 'SofJhXemC5e6HsISPPGYp6M5chNFGjI46I12XyV2N9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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