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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7379438fb6e1dc3d5349d589345fdf8b4c2e11391290d7d875ee91e0209c00' 
  AND token = '9xnA8MTlqCLj1lpHjouu30bpH1jkvDiPxq5Jx4vyhHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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