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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902d5b9090ce1397fff3b0d3e46d77232d6431dc27b22907354c715d6df820c6' 
  AND token = '+y1UNaFMM0tOt9KrlstRkr7S2hVmDWMhBHylcyHw2pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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