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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e19c8d38d04afcc4e52359a07701d7b6d70208995e3011c16dcee0cf729d51a' 
  AND token = 'DF5BUM0ha56d/rUij8JWqcu6x4LCxdIAV1Q/8fDp5ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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