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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a14234bd5e8df99ec7348fcac2c71bb556e2971829d4f99517a83af5a0b64f6' 
  AND token = 'aTvIKIPYVFmJICNe/MXYVWmmO3Lx+OCiEOR5I4W3DVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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