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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd9871b0d2a5b1e72d884b2d81292cc4ee03d4dec5713d9164837040092825e' 
  AND token = 'xgjD+MbMh0+uoKb7Sc/0gpxvq4wWdXbMr+gXzBZAPb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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