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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802088348cf6b996b20fd2d007899aa195c9027c96b4eb672f2bfabd7fe2e2e4' 
  AND token = 'ir/F0CPZJzs1IaWNpmkAaep5am8v7J4LeLDLKasbjes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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