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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a65db6203448757724aad4df1b1d03b6964b4c5ad21ab6ba1895725e7b2946' 
  AND token = 'K89pyVV1vRSA/niruuBT+yIolGF800EMOQTdNlvI7J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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