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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7e4c8608911d0c8f9c1742aaccdd1ce086ca3ba9693de27954fc2f83cd0ecd' 
  AND token = 'H2NDfVlDBaD8AhvSdcHdBhF5CclbQG/tRbRej6NOJWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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