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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737c859e9635b5cda55b0f0d9046851bdba4d22996ba0166d0b3e4010998b9cd' 
  AND token = 'rd+BSlWETyrmzk4JfBhfToQN6inhjUMe3DlVramLxvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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