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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceaf9c5125f8e81d46f2f33875b3462b16cc79823c5425573e58a47dea8e608c' 
  AND token = 'RPv4iXvTZzsW8ZhQAaTaKwgoK7zfEeSmKIKfAu/T7WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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