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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c5310fe97b3428dc8c3758c26450a050cb8bb7612e52c9105e4394788d0df9' 
  AND token = '4Z4BfyUUkK/M1uqPbDo2wvKCI6PgFPJpSGpu8e20m5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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